If sperm falls and dries does that place become napaak?

Assalamu Alaykum Mufti ,1) If a couple has intercourse or does something of the sexual manner and the sperm happens to fall on the floor etc .. if the sperm dries does that place become paak again? or would that place have to still be cleaned and how so if carpet and if tiles would we just have to wipe it with a cloth2)if the sperm went onto other things and we cant recall where , what do we do now , especially if the dried sperm doesnt become paak and what if by mistake we walked in some and then it went across the house .. what do we do ? 3)If it happened at someone elses house , do we have to inform them .. and can Ibaadat still be prayed on this place … like Qur’an recitation .. and Nafl Namaaz ?

Maaf for the nature of these questions , i realise should have been more careful but now this is worrying me !